JPS5828232B2 - Tokebuhinnoketsugohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for joining watch parts, in which a metal layer is formed on the surface of a non-metal inorganic material such as glass, crystal, ceramic, etc., and the metal layer is joined by soldering. This is related to the same thing.

Conventionally, watch parts have been joined by soldering to nonmetallic inorganic materials on which chromium and gold are vapor-deposited, or to nonmetallic inorganic materials and metals.

However, the connection of watch parts has come to be used in a wide variety of applications, for example, the attachment of a holding wire for a crystal unit that requires extreme tensile strength requires the solder to wet the metal well when joining or soldering the parts. It is not suitable for sealing the cell part liquid crystal inlet for liquid crystal watches, or for bonding with a partner.

In the case of a thin film structure consisting of chromium and gold, the solder and gold form an alloy due to the heat during soldering, and the tensile strength of the holding wire is 1.0K, which makes it easy to peel off from the interface between the chrome and gold.
g/- or less, which was difficult as a method for joining watch parts.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a schematic diagram of a conventional bonding method, in which a non-metallic inorganic material 1 such as glass, crystal, or ceramic is heated at 250 m
Heat to ~300°C and apply 300% chromium 2 on the surface.
~600A, then gold 7 was deposited to a thickness of 2000~3000A, and the metal wire 6 was bonded with solder 5.

In conventional technology, with a two-layer film of chrome, which has good adhesion to glass, and baladium, which has good adhesion and wettability to solder, the chrome and baladium are extremely susceptible to heat from the soldering iron or hot air during soldering. Baladium, which has a weak adhesion to the glass, appears on the glass substrate surface, and the adhesion at the interface between the glass substrate surface and the chrome is poor, resulting in a peeling phenomenon from the interface, resulting in poor reproducibility.

The tensile strength of the structure is around 2.0 kg/m4.

FIG. 2 shows an embodiment of joining timepiece parts according to the present invention.

The glass substrate 21 is placed in a vacuum evaporation tank with a vacuum degree of 10 to 10 Torr, and at a substrate heating temperature of around 300°C, approximately 30 OA of chromium 22, which has good adhesion to non-metallic inorganic materials such as glass, is evaporated by a vacuum evaporation method. Next, approximately 200OA of nickel-23, which has excellent affinity with chromium,
Next, about 20 OA of Baladium 24, which has good adhesion and wettability with solder, was deposited.

A holding wire 26 is bonded to the three-layer film of chromium, nickel, and baladium using solder 25 using hot air or a soldering iron.

The purpose of the present invention is to eliminate the drawbacks of the prior art and to firmly bond non-metallic inorganic materials to metals or non-metallic inorganic materials by soldering. By sandwiching it in the intermediate layer, the shielding effect of nickel prevents the extreme diffusion of chromium and baladium against the heat during soldering, and its excellent affinity makes it possible to provide a strong metal film. .

In addition, metal materials that have the same properties as chromium and can be replaced with chromium include nickel-chromium alloy, titanium, tungsten, and molybdenum. Similarly, metal materials that can be replaced with baladium include copper, gold, lead, tin,
It is obvious that silver, indium, cadmium, antimony, etc. all have good affinity with solder and can be used as crosspiece materials.

Plate thickness 0. ] Using a metal mask with 1-diameter holes drilled in several places using mrn, chromium, nickel, and baladium were sequentially deposited on the glass substrate surface under the above conditions by the method of the present invention, and as a result of repeated experiments, the results were as follows. It was confirmed that a deposited film with strong adhesion could be obtained.

The tensile strength of the joint of the watch component formed under these conditions is 5 to 61 cg/ma.

The tensile strength of the joined parts according to the invention is shown in the table in comparison with the conventional method.

Figure 3 shows the application of the metal film formed by the method of the present invention to a crystal oscillator support electrode and an outer container of a crystal oscillator. This is an application to the joints of cases.

In this way, a wide variety of applications are possible as a method for bonding to the surface of nonmetallic inorganic materials.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of the conventional method of joining watch parts;
The figure is a schematic cross-sectional view of the structure of the embodiment according to the present invention, the third and fourth
The figures are a perspective view and a sectional view showing an applied example of the joining method. 1.21... Glass substrate, 2,22... Chrome layer, 3.23... Nickel layer, 4... Baladium layer, 5°25... Solder, 6... Metal holding wire, 7...
metal.

Claims (1)

[Claims] 1 A three-layer structure metal film is formed on the surface of a non-metallic inorganic material such as glass, crystal, ceramic, etc., and one layer in the middle of the three layers is a nickel metal and has a metal layer that can be soldered. A method for joining watch parts, characterized by: